Magnetic recording media and magnetic recording system using the same

Abstract

A magnetic recording system includes an in-plane magnetic recording medium having a magnetic layer fabricated on a single underlayer or on a plurality of underlayers respectively fabricated on a substrate; a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head having a read unit and a write unit; a unit for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.

1. A magnetic recording medium comprising:
 a magnetic layer, 
 a substrate, 
 an underlayer formed between said magnetic layer and said substrate, 
 wherein said underlayer is at least one or more layers, 
 one of said layers includes an alloy material, 
 said alloy material includes Cr as the main component, at least one element selected from a first group including Ti, V and at least one element selected from a second group including B, C, P and Bi. 
 
     
     
       2. A magnetic recording medium according to  claim 1 , wherein said one of said layers substantially includes Cr, B and Ti. 
     
     
       3. A magnetic recording medium according to  claim 1 , wherein
 a concentration of said at least one element selected from said second group is 1 at % or higher and 20 at % or lower. 
 
     
     
       4. A magnetic recording medium including a magnetic layer formed over a substrate through one or more underlayers, wherein
 at least one layer of said one or more underlayers includes Cr as a main component, contains at least one element selected from a first group consisting of Ti and V, and an alloy material containing at least one element selected from a second group consisting of B, C, P and Bi. 
 
     
     
       5. The magnetic recording medium according to  claim 4 , wherein said underlayer having the Cr as a main component substantially includes Cr, Ti and B. 
     
     
       6. The magnetic recording medium according to  claim 4 , wherein concentration of said at least one element selected from said second group contained in said underlayer having the Cr as a main component, is 1 at % or higher and 20 at % or lower. 
     
     
       7. A magnetic recording apparatus including a magnetic recording medium having a magnetic layer formed over a substrate through one or more underlayers, a driving unit driving said magnetic recording medium in a direction of the recording, a magnetic head including a recording part and a reproducing part, a motion unit giving said magnetic head a relative motion in regard to said magnetic recording medium, and a recording and reproducing signaling unit performing a signal input and an output signal reproduction of said magnetic head, wherein
 a reproduction part of said magnetic head is constituted by a magnetoresistance magnetic head, and wherein 
 at least one layer of said one or more underlayers includes Cr as a main component, contains at least one element selected from a first group consisting of Ti and V, and an alloy material containing at least one element selected from a second group consisting of B, C, P and Bi. 
 
     
     
       8. The magnetic recording apparatus according to  claim 7 , wherein said underlayer having the Cr as a main component substantially includes Cr, Ti and B.